Amazon 100$ Promo code

How do I make a promotional code that would give someone doing feedback, a FREE item of their choosing?
Please do anyone have any experience you could share with me?
All I see is 99% off or they have top pay $1.00.

Thank you in advance for any advise given.

Think this is in the wrong place.

You can do this here: https://www.amzreviewtrader.com/